Dynamic range reducing volume control

Details Dynamic range reducing volume control Dynamic range reducing volume control

2004-02-06

2009-08-25

Lee, Ping (Department: 2614)

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

C381S086000, C381S057000

Reexamination Certificate

active

07580531

ABSTRACT:
An audio amplifier is provided having a compressor with an automatically-adjustable compressor. Compression is linked to the volume control in an inverse relationship whereby, when the volume is reduced, the compression ratio is increased to boost the listening level of quieter passages in the source material. Conversely, when the volume is increased, the compression ratio is decreased. The compression control may be physically connected to the volume control, such as in a dual-potentiometer, or may be coupled electronically, such as with a digital signal processor. An effects level control may be included to allow a listener to increase or decrease the effect of the compression by applying a multiplier to the compression ratio. An ambient noise detector may also be included such that compression is increased as ambient noise increases or exceeds a predetermined level.

REFERENCES:
patent: 4216427 (1980-08-01), Bethards
patent: 5471651 (1995-11-01), Wilson
patent: 5892834 (1999-04-01), Smart et al.
patent: 5907622 (1999-05-01), Dougherty
patent: 6278751 (2001-08-01), Uramoto
patent: 6473662 (2002-10-01), Lubbe et al.
patent: 7333618 (2008-02-01), Shuttleworth et al.

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